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LOW 3.8 Go

Mattermost Fails to Properly Validate Team Role Modification

GHSA-4276-cm8c-788h · CVE-2025-53971 · GO-2025-3902

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Description

Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint.

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